(4R,5S)-5-tert-butyldimethylsilyloxymethyl-2,2-dimethyl-1,3-dioxolane-4-carbaldehyde 、 (4-Methoxy-benzenesulfonylamino)-acetic acid benzyl ester 在
lithium diisopropyl amide 、 tin(ll) chloride 作用下,
以65%的产率得到(S)-3-[(4S,5S)-5-(tert-Butyl-dimethyl-silanyloxymethyl)-2,2-dimethyl-[1,3]dioxolan-4-yl]-3-hydroxy-2-(4-methoxy-benzenesulfonylamino)-propionic acid benzyl ester